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Polymers (Basel). 2021 Jan 07;13(2). doi: 10.3390/polym13020193.

Polymer-Nematic Liquid Crystal Interface: On the Role of the Liquid Crystalline Molecular Structure and the Phase Sequence in Photoalignment.

Polymers

Ameer R K Nassrah, István Jánossy, Viktor Kenderesi, Tibor Tóth-Katona

Affiliations

  1. Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary.

PMID: 33430256 PMCID: PMC7825733 DOI: 10.3390/polym13020193

Abstract

We provide experimental evidence for the influence of the molecular structure of the nematic liquid crystal (NLC) on the photoalignment process in three dimensions at the interface with a polymer layer. In particular, the experimental findings are explained through the presence (or absence) of the π-π aromatic interactions between the NLC and the polymer. The influence of the nematic-to-smectic A phase transition on the photocontrol is also addressed. Furthermore, we demonstrate that the photo-induced reorientation scenarios can be eventually connected to conformational changes in the photosensitive polymer.

Keywords: nematic–polymer interface; optical actuators; optical sensors; photoalignment

References

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